Why common salt is sometimes yellow instead of being pure white ?
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Hydrogen being a highly inflammable gas and oxygen being a supporter of combustion, Why?
The properties of compound are different from its constituent elements. Water which is a compound of oxygen and hydrogen has property to extinguish fire though its constituent elements do not...
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In peas, a pure tall plant (TT) is crossed with a short plant (tt). The ratio of pure tall plants to short plants in F2 is
(c) 1 : 1, is the correct option.
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Why does the sky appear dark instead of blue to an astronaut?
The sky appears dark instead of blue to an astronaut because there is no atmosphere in the outer space that can scatter the sunlight. As the sunlight is not scattered, no...
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In the experiment it is found that 2.0769 gram of pure X produce 3. 6769 gram of pure x2o5 the number of mole of X is
The balanced equation for the above reaction is 2 X + 5/2 O2 → X2O5 Now the mass of oxygen using law of conservation of mass = 3.6769 - 2.0769 Hence mass of Oxygen...
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Which of the following statements are true for pure substances? (i) Pure substances contain only one kind of particles
(b) (i) and (iii)
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Some of the very old glass objects appear slightly milky instead of being transparent. Why ?
Reallignment of molecules takes place due to movement because of constant heating and cooling.
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In one of his experiments with pea plants Mendel observed that when a pure tall pea plant is crossed with a pure dwarf pea plant,
(a) The dwarf traits of the plants is not expressed in the presence of the dominant tall trait. (b) In the F2 generation, both the tall and dwarf traits are present in...
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Dissolve two spoons of common salt in half a cup of water. Now if you want to get the salt back, what will you do?
Water may be removed from the salt solution by heating it on a stove or keeping it in the sun in a plate for few hours.
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Concentrated hydrochloric acid when kept in open air sometimes produces a cloud of white fumes.
(c) :- HCl gas in presence of moisture in air forms droplets of liquid solution in the form of cloudy smoke.
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Have you noticed that sometimes singers put their hand on their ear when they sing? Why do you think they may be doing this?
Yes, I have noticed the same. I think they do so because after putting their hand on their ear, they not only protect themselves from the noises but also hear...
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